Feeding mechanism for sewing-machines



(No Model.) 2 SheetsSheet 1.

J. BOLTON. FEEDING MECHANISM FOR SEWING MAOHINES.

No. 484,402. Patented Oct. 18, 1892.

2 Sheets-Sheet 2,

(No Model.)

J. BOLTON. FEEDING MECHANISM FOR SEWING MACHINES.

Patented Oct. 18, 18492.

q vbbnwow m: NORRIS versus col, PHOTD-LITHO., NASH UNITED STATES PATENTOFFICE.

JAMES BOLTON, OF CHICAGO, ILLINOIS.

FEEDING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 484,402, dated October18, 1892.

Application filed March 3, 1892- Serial No. 423,643. (No model.)

To all whom it may concern:

Be it known that I, JAMES BOLTON, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Sewing-Machine FeedingMechanisms, of which the following is a specification, reference beinghad therein to the accompanying drawings.

My invention has for its object to provide an improved sewing-machinefeeding mechanism in which the main rotating shaft is journaled in theupper part of the arm of the machine and is provided with a crank oreccentric the movements of which aretransmitted to the mechanism beneaththe work-plate by a pitman-lever.

In carrying my invention into eifcet the vibrating movements of thepitman-lever are utilized for imparting motion to a rock-shaft, fromwhich the longitudinal or feeding movements are given to the feed-barand a feed-dog carried thereby. The lifting movements of the feed-barand feed-dog are derived from a suitable cam on a second shaft, whichreceives its movements from the pitman-lever.

In the accompanying drawings, Figure 1 is a side view, partly insection,of a sewing-machine embodying my invention. Fig. 2 is a bottomview of the same. Fig. 3 is a sectional view on line 3 3, Fig. 1,looking in the direction of the arrows adjacentto said line. 4 and 5 aredetail views.

A denotes the Work-plate, and B the bracketarm, of a sewingmachine.Journaled in the upper part of the bracket-arm B is the maindriving-shaft 0, provided with a crank or eccentric c, to which isconnected the upper end of a pitman-lever D, the latter being slotted toreceive a pivot-pin d, which is rigidly secured in the vertical portionof the bracketarm. Surrounding the pivot-pin cl and embraced by theslotted portion of the pitmanlever is a rocking block E, provided with acurved rocker e, which is rigidly attached to said block or formedintegral therewith. The said rocker is slotted to receive a slidingblock f, provided with a pin f, to which is jointed the upper end of alink or pitman F, connected at its lower end to an arm g, formed on therear end of a feed-operating rock-shaft G, suitably journaled beneaththe work-plate of the machine and having at its forward end arms 9', inwhich is pivoted a rod h, to which latter is attached the feed-bar H,provided with a feed-dog h of any well-known construction. Surroundingthe rod h is a torsional spiral spring 2', connected at one end to oneof the arms g and at its other end to a pin h fixed to the feed-bar H.

Pivoted to the vertical partof the bracketarm 13 is afeed-regulatingbell-crank lever J, the upper arm of which is slotted to embrace the pinf of the slide or block f, which is movable in the slot of the curvedrocker 6, so that the said slide or block f may be adjusted nearer to orfarther from the pin (1, which formsits center of movement, to therebyregulate the rocking movements of the shaft G, and consequently vary thehorizontal movements of the feed-bar. When the slide or blockfis in thehorizontal position shown in Fig. 3, near one outer extremity of therocker e, the feed movements of the feed-bar will be nearly or quite attheir greatest length and in a forward direction; but if the said slidebe adjusted to the opposite side of the fulcrumpin d the feed will bereversed and the length of the reversed feed can of course be varied byadjusting the slide or blockf to different positions nearer to orfarther from the said fulcrum-pin.

Instead of connecting the lower end of the pitman-lever D directly tothe arm of a shaft arranged beneath the work-plate in the usual manner,so as to impart a rotary movement to the said shaft, I have herein shownthe said pitman-lever as being somewhat shortened and having its lowerend connected by alink or pitman i to an arm 2' on the rear end of ashaft I, supported beneath the work-plate, and to which a rockinginstead of a rotating movement is to be imparted. This rocking shaft isherein shown as being provided with an inclined crank-arm 6 providedwith a crank-pin i at a right angle thereto and embraced bya yoke on therear end of the shuttle-operating lever .I, as shown in my applicationSerial No. 423,146, filed February 29, 1892, and this shuttle-operatingmechanism is therefore not claimed in this specification. The said shaftI is provided near its forward end with a cam i on which rests a pin orrollerstud b carried by the feed-bar H, the said pin or roller-studbeing held in contact with of the cam on the rock-shaftI for raising thefeed-bar an equivalent cam forefiecting this operation and carried by arotating shaft may be employed.

Having thus described my invention, I claim and desire to secure byLetters Patent 1. In a sewing-machine, the combination,

. with the main rotating driving-shaft arranged in the upper part of thearm of the machine and provided with a crank or eccentric, of afeed-operating rock-shaft arranged beneath the work-plate of themachine, a feed-bar connected to the forward end of the rock-shaft andprovided with a suitable feed-dog, a pitman-lever operated by said crankor eccentric and provided with a slotted portion, a rocking blockembraced by the slotted porition of the said pitman-lever and providedwith a slotted rocker, aslide orblock arranged in the slot of saidrocker and provided with a pin, a link or pitman connecting the said pinwith an arm on the rear end of the said feed-operating rock-shaft, afeed-regulating device for adjusting said block or slide in the saidrocker, and means for imparting vertical movements to the said feed-bar.

2. In a sewing-machine, the combination, with themain rotatingdriving-shaft C, journaled in the upper part of the arm of the machineaud provided with a crank or eccentric c, a feed-operating rock-shaft G,arranged beneath the work-plate of the machine and having arms atits'forward and rear ends, a feedbar connected with the arm or arms atthe forward end of the said rock-shaft and provided with a suitablefeed-dog, a pitman-lever connected to said crank or eccentric andprovided with a slotted portion, a rocking block E, embraced by theslotted portion of the said pitman-lever and provided with a slottedrocker, an adjustable slide received in the slot of said rocker andprovided with a pin, a link or pitman jointed to said pin and to the armon the rear end of said feed-operating rock-shaft, a feed regulatinglever for adj usting said slide in the slot of the rocker, ashuttle-operatingrock-shaftarrangedbeneath the work-plate of the machineand provided near its forward end with a feed-bar-lifting cam and at itsrear end with a suitable arm, a link or pitman connecting the lower endof the said pitman-lever to the said arm on the rear end of the saidshuttle-operating ro'ckshaft, and a spring for assisting in the downwardmovements of the feed-bar.

In testimony whereof I affix my signature in presence of two witnesses.I

JAMES BOLTON. Witnesses:

T. M. CoNPRoPs'r, F. S. FOUSE.

